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PIERRE LE GOAZIOU
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PIERRE LE GOAZIOU
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Publication of FR22502EpublicationCriticalpatent/FR22502E/fr
G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
FR22502A1917-12-171917-12-17Appareils pour découvrir l'approche et repérer la direction d'une source sonore sous-marine ou aérienne
ExpiredFR22502E
(fr)
Appareil pour la transmission et la reproduction d'ondes acoustiques, pour la phonocinématographie, le photogramophone et des applications analogues